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OEM Lennox Contactor 3-Pole 120V 50A — 77X59
Lennox

OEM Lennox Contactor 3-Pole 120V 50A — 77X59

SKU: LNX-77X59 Brand: Lennox
$28.95 $38.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 77X59 is a three-pole contactor featuring a 120-volt control coil and a 50-amp per-pole rating. It serves as the primary switching device that energizes the compressor and outdoor fan across three legs of power in Lennox equipment using a line-voltage (120V) control circuit rather than the more common 24V.

Typical failure symptoms include a loud buzzing or chattering from the coil, contacts that weld shut and leave the compressor running continuously, visibly pitted or burnt terminals, and a unit that fails to start. Because the 77X59 uses a 120V coil, verifying the correct control voltage before replacement is essential — a 24V substitute will not pull in properly.

Using the OEM part guarantees the coil voltage, contact ratings, and three-pole layout match your Lennox system exactly. Generic contactors with the wrong coil voltage or amperage can cause failed starts, compressor stress, and premature burnout. This factory-spec 77X59 ensures correct operation, proper fit, and full rated durability.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Contactor fit my Lennox OEM Lennox Contactor 3-Pole 120V 50A — 77X59?
Yes. This is the factory-specified OEM contactor for the Lennox OEM Lennox Contactor 3-Pole 120V 50A — 77X59. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the contactor on my Lennox OEM Lennox Contactor 3-Pole 120V 50A — 77X59?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.
My AC clicks but the compressor won’t turn on. What’s wrong?
Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.
Is this contactor compatible with Bryant or Payne too?
Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Lennox contactor?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
HVAC Parts Specialist — Online